Brown flarworm?

[FunWithFishes]

Hey everyone! So about a week ago I got some green hairy coral. It has been doing very well in my tank, but this morning I noticed a small brown blob with a white spot on it's back stealing a piece of mysis shrimp from it. I sucked the little guy up and put him into a bowl, but I don't know what he is. I figured a flatworm, but most sources say they have two tails, where this only has one and a little white spot (noticeable in picture 3) I apologize for the blurry photos, but I had to zoom way in to see it.

Anyone have any ideas?

 

[FunWithFishes]

It is grabbed on to a mysis shrimp btw

 

[DSC reef]

Could be a polyclad, hope not. Can't give a positive ID though.

 

[FunWithFishes]

After some inspection, I noticed 2 more. Both have the 2 tails so I'm gonna assume flatworm.

 

[KJ]

Amphiscolops.